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Chotoku, M.,Nojima, T.,Ochiai, A.,Aoki, H.,Lee, H.G.,Lee, S.I. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
We have performed the detailed measurements of temperature dependence of magnetization M(T) on MgB<SUB>2</SUB> single crystals in a wide range of field H using torque magnetometry. In a field region, where the peak effect in M(H) is observed, we find that M(T) of the warming branch increases monotonously with T and exhibits a small step-like increase at T<SUB>1</SUB><SUP>*</SUP>, which is related to the order-disorder transition, while M(T) of the cooling branch, showing the larger values than that in warming branch below T<SUB>1</SUB><SUP>*</SUP>, drops suddenly toward the warming branch at T<SUB>2</SUB><SUP>*</SUP>. We ascribe this anomalous behavior of M(T) of the cooling branch to a supercooling phenomenon of disordered phase, which transforms to the ordered state at T<SUB>2</SUB><SUP>*</SUP>.
Ochiai, H.,Park, H.M.,Sasaki, R.,Okumura, J.,Muramatsu, T. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.1
Factors affecting gene gun-mediated expression of the human erythropoietin gene were investigated in primary cultured oviduct cells from laying hens. The human erythropoietin gene was transfected by a gene gun method at $1.25{\mu}g$ per dish, and cultured in a synthetic serum-free medium for 72 hrs. The concentration of human erythropoietin mRNA was determined by RNA : RNA solution hybridization. In experiment 1, the effect of changing the shooting pressure of DNA-coated microparticles with nitrogen gas was tested at 20 and $60kgf/cm^2$. The results showed that the erythropoietin mRNA concentration was significantly higher at 60 than $20kgf/cm^2$. In experiment 2, the effects of supplementing the medium with fetal calf serum at 10%, and raising the shooting pressure from 60 to $80kgf/cm^2$ on the cell number and erythropoietin gene expression were examined. Although supplementation with fetal calf serum significantly increased the cell numbes compared with no supplemented controls (p < 0.05), erythropoietin mRNA concentration per $10^3$ cells was not affected. Raising the shooting pressure from 60 to $80kgf/cm^2$ did not affect either of the parameters, In experiment 3, the effect of supplementing ascorbate 2-phosphate at 0.5 mM was tested. The results indicated that the ascorbate supplementation significantly increased the cell number (p < 0.05), and tended to increase erythropoietin mRNA concentration (p < 0.1). Thus, for human erythropoietin gene expression by using the gene gun method, shooting pressure with nitrogen gas should be sufficient at $60kgf/cm^2$ and supplementation with ascorbate phosphate would be useful to enhance not only the cell proliferation but also erythropoietin gene expression.
Stress analysis with arbitrary body force by triple-reciprocity BEM
Ochiai, Y.,Kobayashi, T. Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.10 No.4
Linear stress analysis without body force can be easily solved by means of the boundary element method. Some cases of linear stress analysis with body force can also be solved without a domain integral. However, domain integrals are generally necessary to solve the linear stress problem with arbitrary body forces. This paper shows that the linear stress problem with arbitrary body forces can be solved approximately without a domain integral by the triple-reciprocity boundary element method. In this method, the distribution of arbitrary body forces can be interpolated by the integral equation. A new computer program is developed and applied to several problems.
A novel quantum interference probe of the energy spectrum of coupled nanodevices
T.P. Martin,R.P. Taylor,H. Linke,B. Murray,N. Aoki,D. Oonishi,Y. Iwase,Y. OchiaI 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Quantum transport of an array of quantum billiards is investigated as a function of the coupling strength of the quantum point con-invasive probe of two characteristic energy scales of the energy level spectrumthe average energy level spacing and average energy levelbroadening. This analysis reveals a marked transition in the coherent area of the array as the coupling between the billiards is increasedand the array evolves into a combined quantum system.
Somiya, Shigeyuki,Murakami, T.,Ochiai, S.,Inoue, M.,Hishinuma, K.,Akiba, T. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
Zirconia powder are produced many ways. This is review and overview of fine zirconia powders. There are seveal methods to produce fine zirconia powder. Hydrtothermal homogeneous precipitation is one of the best methods to produce zironia fine powder.